Check the listing for details. ear tips for Etymotic Research Earphone ER-4S-B earbuds replacements small large. Color: Clear, Condition: New. Listed at 8.44 USD. Ear Tip Replacements for Etymotic Research Earphone ER-4S-B earbuds Our tips are made of a soft silicone for a comfortable noise isolating fit, They come with a hole for a 2 mm speaker stem and will fit up to a 2.5 mm speaker stem. We refer to the part of your earbud that the tip fits on, as a speaker stem. Washable and Waterproof You will receive the following.3 pairs small / 3 pairs large( 12 pcs. ) Sizing instructions : Earbud tip sizing is actually very simple , You have two things to look at. 1. The size of your speaker stem ( we refer to the part of your earbud our tips fit on as a speaker stem ).2. Then second, the hole size of our tips. Our triple flange tips will fit all earbud types with a speaker stem diameter from a 2 mm which is equivalent to ( 1/16 ) to a 2.5 mm. ABOUT US : We are a earbud replacement Store, our primary product is earbud replacement tips. PAYMENT : We accept PayPal, Google Pay, Apple Pay, Visa, Mastercard, American Express and Discover. SHIPPING & HANDLING : We ship all our orders the same day or within 24 hrs of receipt of order.DOMESTIC SHIPPING IS FREE / INTERNATIONAL IS BY LOCATION. REFUNDS & RETURNS : We offer a 30 day " RETURN POLICY ", no questions asked, we supply the return label and refund your money 100%. CUSTOMER SATISFACTION : Customer satisfaction is very important to us, if you are not totally satisfied with your purchase, we will make it right, GUARANTEED. Our tips are generic non branded tips, we do not support or have any affiliation, association or partnership with the brands listed. They are compatible replacement parts.